Rhythm. Normal cardiac rhythm arises from the SA node (sinus rhythm) but pacemaker impulses can come from ectopic foci in the atria, the AV junction, and the ventricles under abnormal conditions. When an ectopic impulse occurs singly, it generates a beat; when the beat repeats itself, it becomes a rhythm.
The Ksp value is calculated from the concentrations of the products of Ca(OH)2 when the compound is added to an aqueous solution. Calculating the value requires knowing those concentrations, the... The Ksp value is calculated from the concentrations of the products of Ca(OH)2 when the compound is added to an aqueous solution.
PbCl2 is a case in point, it has a Ksp value of 1.2 x 10-5. Based on that it is not possible to have a .1M solution of PbCl2 Such a solution would consist of a [Pb+2]=.1M and a [Cl-]=.2M. Plugging into the Ksp expression gives a value of.[Pb+2][Cl-]^2 = .1 x .2^2 = .004M. Since that exceeds the Ksp value PbCl2 would have to precipitate (thereby lowering the Pb+2 concentration).However, given that they are providing you with answers, it would be possible to make an educated quess based on the fact that PbSO4 is VERY insoluble (the Ksp value is 1.8 x 10-8).ased on that it is not possible to have a .1M solution of PbCl2 Such a solution would consist of a [Pb+2]=.1M and a [Cl-]=.2M. Plugging into the Ksp expression gives a value of. [Pb+2][Cl-]^2 = .1 x .2^2 = .004M. Since that exceeds the Ksp value PbCl2 would have to precipitate (thereby lowering the Pb+2 concentration).